Do It Wrong
I have really long hair, and supposedly the right way to brush really long hair is to start at the tips and work your way to the crown of your head, brushing only a few inches at a time, to prevent knots.
Give me a break.
One of the worst things you can do is the simple act of thinking about how to do something the right way. Don't do it right, don't be perfect. Just do it, and if it's half-assed, at least it's done!
Consider this: I need to build a trellis for some roses. I've been in a minor obsession about this all week, thinking of where to get the materials and how to put it together. Because it needs to be just perfect. Instead, I should either a) go buy a cheap, imperfect trellis, or b) just get some stuff and put the thing together, figuring it out as I go. In either case I would already have the trellis and I could obsess about something else for a while.
Do work when you know you don't have enough time to do it right. Pick something up and throw it out on the way to the door. Clean the sink, but don't scrub it out and clean all the gunk around the faucets. Be imperfect, do a slap-dash job. It'll get you further than sitting around, paralyzed by the need to be perfect.